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TI-2026-41809 Aliases CVE-2026-58055GHSA-xrr7-82jr-v58x

nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

Priority LOW 28CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 14 fixed, 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00253 16th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Partial Red Hat: 28 advisoriesRed Hat: 14 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nghttp2nghttp2up to 1.69.0—No fix listedCNA
  • nghttp2 Vendornghttp2 Affected up to 1.69.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:*up to 1.69.0Vulnerablenghttp2
  • cpe:2.3:a:nghttp2:nghttp2:*:*:*:*:*:*:*:* Versions up to 1.69.0 Vulnerable ·nghttp2

Remediation

Red Hat 28 advisories

  • RHSA-2026:86895 Released 2026-10-21 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libnghttp2-1.70.0-0.1.hum1@aarch64, libnghttp2-1.70.0-0.1.hum1@s390x, libnghttp2-1.70.0-0.1.hum1@x86_64 +13
  • RHSA-2026:82888 Released 2026-10-14 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.17.2
    • Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/cert-manager-operator-bundle
  • RHSA-2026:82857 Released 2026-10-14 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-bundle
Show 25 more Red Hat advisories
  • RHSA-2026:82372 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:82354 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:82347 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.18.2
    • Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:82336 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.17.1
    • Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:82322 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.17.2
    • Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:82304 Released 2026-10-13 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.17.2
    • Cert Manager support for Red Hat OpenShift release 1.17 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:72502 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-trust-manager-rhel9
  • RHSA-2026:72476 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:72475 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:72470 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:72399 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:72395 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:72394 Released 2026-09-28 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.20.1
    • Cert Manager support for Red Hat OpenShift release 1.20 registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:66018 Released 2026-09-09 · Red Hat rating Important
    Red Hat Update Infrastructure 5.3 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:63140 Released 2026-09-03 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.19.2
    • Cert Manager support for Red Hat OpenShift release 1.19 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
  • RHSA-2026:63138 Released 2026-09-03 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.19.2
    • Cert Manager support for Red Hat OpenShift release 1.19 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
  • RHSA-2026:63135 Released 2026-09-03 · Red Hat rating Important
    cert-manager Operator for Red Hat OpenShift 1.19.2
    • Cert Manager support for Red Hat OpenShift release 1.19 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
  • RHSA-2026:61783 Released 2026-08-31 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:58981 Released 2026-08-24 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.3 Technology Preview security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
  • RHSA-2026:55804 Released 2026-08-17 · Red Hat rating Moderate
    nghttp2 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) libnghttp2-1.33.0-6.el8_10.3, nghttp2-1.33.0-6.el8_10.3
    • Red Hat Enterprise Linux CRB (v. 8) libnghttp2-devel-1.33.0-6.el8_10.3, nghttp2-1.33.0-6.el8_10.3
  • RHSA-2026:54662 Released 2026-08-13 · Red Hat rating Moderate
    nghttp2 security update
    • Red Hat Enterprise Linux BaseOS (v. 9) libnghttp2-1.43.0-6.el9_8.2, nghttp2-1.43.0-6.el9_8.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libnghttp2-devel-1.43.0-6.el9_8.2, nghttp2-1.43.0-6.el9_8.2
  • RHSA-2026:54650 Released 2026-08-13 · Red Hat rating Moderate
    nghttp2 security update
    • Red Hat Enterprise Linux AppStream (v. 10) libnghttp2-devel-1.68.0-3.el10_2.2
    • Red Hat Enterprise Linux BaseOS (v. 10) libnghttp2-1.68.0-3.el10_2.2, nghttp2-1.68.0-3.el10_2.2
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nghttp2-1.68.0-3.el10_2.2
  • RHSA-2026:52414 Released 2026-08-10 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libnghttp2-1.69.0-5.hum1@aarch64, libnghttp2-1.69.0-5.hum1@x86_64, libnghttp2-devel-1.69.0-5.hum1@aarch64 +8
  • RHSA-2026:41240 Released 2026-07-17 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images curl-8.21.0-0.1.1.hum1@aarch64, curl-8.21.0-0.1.1.hum1@src, curl-8.21.0-0.1.1.hum1@x86_64 +6
  • RHSA-2026:35454 Released 2026-07-03 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libnghttp2-1.69.0-3.1.hum1@aarch64, libnghttp2-1.69.0-3.1.hum1@x86_64, libnghttp2-devel-1.69.0-3.1.hum1@aarch64 +8

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
Cert Manager support for Red Hat OpenShift release 1.17Fixed RHSA-2026:82304, RHSA-2026:82322, RHSA-2026:82336, RHSA-2026:82888
Cert Manager support for Red Hat OpenShift release 1.18Fixed RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857
Cert Manager support for Red Hat OpenShift release 1.19Fixed RHSA-2026:63135, RHSA-2026:63138, RHSA-2026:63140
Cert Manager support for Red Hat OpenShift release 1.20Fixed RHSA-2026:72394, RHSA-2026:72395, RHSA-2026:72399, RHSA-2026:72470, RHSA-2026:72475, RHSA-2026:72476, RHSA-2026:72502
Red Hat Discovery 2Fixed RHSA-2026:61783
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:54650
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:54650
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:55804
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:54662
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:55804
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:54650
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:54662
Red Hat Hardened ImagesFixed RHSA-2026:35454, RHSA-2026:41240, RHSA-2026:52414, RHSA-2026:86895
Red Hat Update Infrastructure 5Fixed RHSA-2026:58981, RHSA-2026:66018
Not affected: 3 products
  • Cert Manager support for Red Hat OpenShift release 1.20
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58055
  2. 2026-10-03 Alias added: GHSA-xrr7-82jr-v58x
  3. 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
  4. 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
  5. 2026-10-14 Fix available: RHSA-2026:82336 · Red Hat
  6. 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
  7. 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
  8. 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
  9. 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
  10. 2026-10-15 Fix available: RHSA-2026:82888 · Red Hat
  11. 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.17, Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat
  12. 2026-10-22 Fix available: RHSA-2026:86895 · Red Hat
  13. 2026-10-22 Affected versions changed · Red Hat
  14. 2026-11-03 Affected versions changed · Red Hat
  15. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-18006 Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec CVSS 3.1HIGH 7.5
  • TI-2024-18758 Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage CVSS 3.1MEDIUM 5.3
  • TI-2018-15818 nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation… CVSS 3.1HIGH 7.5
  • TI-2015-07121 The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified… CVSS 3.0CRITICAL 10.0
  • TI-2020-08954 Denial of service in nghttp2 CVSS 3.1HIGH 7.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences