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TI-2021-08827 Aliases CVE-2021-27293GHSA-9pq7-rcxv-47vq

RestSharp < 106.11.8-alpha.0.13 uses a regular expression which is vulnerable to Regular…

Priority LOW 36CWE-697Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

RestSharp < 106.11.8-alpha.0.13 uses a regular expression which is vulnerable to Regular Expression Denial of Service (ReDoS) when converting strings into DateTimes. If a server responds with a malicious string, the client using RestSharp will be stuck processing it for an exceedingly long time. Thus the remote server can trigger Denial of Service.

Why it matters now

EPSS 0.01508 74th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed RestSharp (NuGet): 106.11.8-alpha.0.13

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—RestSharp (NuGet)before 106.11.8-alpha.0.13106.11.8-alpha.0.13Patch availableGHSA-9pq7-rcxv-47vq
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • RestSharp (NuGet) Vendor— Affected before 106.11.8-alpha.0.13 Fixed in 106.11.8-alpha.0.13 Patch available GHSA-9pq7-rcxv-47vq

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:a:restsharp:restsharp:*:*:*:*:*:*:*:*up to 106.11.7Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.10:*:*:*:*:*:*106.11.8 alpha0.10Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.11:*:*:*:*:*:*106.11.8 alpha0.11Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.12:*:*:*:*:*:*106.11.8 alpha0.12Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.2:*:*:*:*:*:*106.11.8 alpha0.2Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.3:*:*:*:*:*:*106.11.8 alpha0.3Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.4:*:*:*:*:*:*106.11.8 alpha0.4Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.6:*:*:*:*:*:*106.11.8 alpha0.6Vulnerablerestsharp
cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.7:*:*:*:*:*:*106.11.8 alpha0.7Vulnerablerestsharp
  • cpe:2.3:a:restsharp:restsharp:*:*:*:*:*:*:*:* Versions up to 106.11.7 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.10:*:*:*:*:*:* Versions 106.11.8 alpha0.10 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.11:*:*:*:*:*:* Versions 106.11.8 alpha0.11 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.12:*:*:*:*:*:* Versions 106.11.8 alpha0.12 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.2:*:*:*:*:*:* Versions 106.11.8 alpha0.2 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.3:*:*:*:*:*:* Versions 106.11.8 alpha0.3 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.4:*:*:*:*:*:* Versions 106.11.8 alpha0.4 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.6:*:*:*:*:*:* Versions 106.11.8 alpha0.6 Vulnerable ·restsharp
  • cpe:2.3:a:restsharp:restsharp:106.11.8:alpha0.7:*:*:*:*:*:* Versions 106.11.8 alpha0.7 Vulnerable ·restsharp

Remediation

  • Fix · GHSA-9pq7-rcxv-47vq RestSharp (NuGet) Fixed in 106.11.8-alpha.0.13 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27293
  2. 2026-10-03 Alias added: GHSA-9pq7-rcxv-47vq

References

Exploit 1

Advisory 1

Other 3

  • TI-2024-30373 CRLF Injection in RestSharp's `RestRequest.AddHeader` method CVSS 3.1HIGH 7.8

Sources

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