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TI-2026-36743 Aliases CVE-2026-49839

jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow

Priority HIGH 66CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Partial Red Hat: 1 fixed, 7 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

jq is a command-line JSON processor. Prior to 1.8.2,` jq --rawfile` can turn a handled oversized-string error into invalid-state reuse and a real heap out-of-bounds write in assertion-disabled builds. When jv_load_file(raw=1) reads an attacker-controlled file, it repeatedly appends file chunks to the same jv string accumulator. Once jv_string_append_buf() returns jv_invalid_with_msg("String too long"), the raw-file loop does not stop. If the file contains at least one more byte, the next loop iteration appends a new chunk to an object that is already invalid. With assertions enabled this aborts in jvp_string_ptr(). With assertions disabled, the invalid object is interpreted as a string object and ASan reports heap-buffer-overflow. This vulnerability is fixed in 1.8.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00165 5th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial jq (jqlang): 1.8.2Red Hat: 1 advisoryRed Hat: 1 fixed, 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
jqlangjqbefore 1.8.21.8.2Patch availableCNA
  • jq Vendorjqlang Affected before 1.8.2 Fixed in 1.8.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*before 1.8.2Vulnerablejqlang
  • cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:* Versions before 1.8.2 Vulnerable ·jqlang

Remediation

  • Fix · CNA jq (jqlang) Fixed in 1.8.2

Red Hat 1 advisory

  • RHSA-2026:29986 Released 2026-06-25 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images jq-1.8.2-0.1.hum1@aarch64, jq-1.8.2-0.1.hum1@src, jq-1.8.2-0.1.hum1@x86_64 +2

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Ansible Automation Platform 2AffectedNo fix yet: Fix deferred
Red Hat Ceph Storage 4AffectedNo fix yet: Fix deferred
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
Red Hat Hardened ImagesFixed RHSA-2026:29986

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49839
  2. 2026-11-06 Affected versions changed · Red Hat

References

Exploit 1

  • TI-2026-24844 jq: Integer overflow in jvp_string_append() allows Heap-based Buffer Overflow CVSS 3.1HIGH 8.2
  • TI-2025-30431 AddressSanitizer: stack-buffer-overflow in jq_fuzz_execute (jv_string_vfmt) CVSS 4.0HIGH 7.7
  • TI-2023-26962 decToString in decNumber/decNumber.c in jq 88f01a7 has a one-byte out-of-bounds write via… CVSS 3.1HIGH 7.5
  • TI-2026-28834 jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers CVSS 4.0MEDIUM 6.9
  • TI-2024-35799 Type confusion in jqlang jq CVSS 3.1HIGH 8.1
  • TI-2024-15439 jq has signed integer overflow in jv.c:jvp_array_write CVSS 3.1MEDIUM 6.5
See all 21 →

Sources

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