Skip to content
Fencer Vulns
high 8.7

CVE-2026-71190 json

In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtrack…

published 2026-08-05 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-53048

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

In OpenStack Swift through 2.38.0, the proxy server Accept header parser contains a regular expression vulnerable to catastrophic backtracking (ReDoS). The "qdtext" pattern (?:[^"]|\\.)* allows an unauthenticated remote attacker to send a crafted Accept header that causes exponential CPU consumption in the proxy worker. A payload of 32 backslash-character pairs exceeds 30 seconds of CPU time. No authentication is required. Repeated requests can exhaust all proxy worker threads, resulting in a complete denial of service.

Patch / fix

  • OpenStack Swift 2.35.4, 2.36.3, 2.37.3
  • swift Debian 12 2.30.1-0+deb12u2
  • swift Debian 14 2.37.1-6

debian advisories DEBIAN-CVE-2026-71190

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71190 updated cvss 7.5

openstack-swift: openstack-swift: Unauthenticated denial of service via catastrophic backtracking in Accept header parser

  • Red Hat OpenStack Platform 13 (Queens) rhosp13/openstack-swift-base, rhosp13/openstack-swift-object, rhosp13/openstack-swift-account, rhosp13/openstack-swift-container, rhosp13/openstack-swift-proxy-server
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenStack Platform 16.2 python3-swift, openstack-swift, openstack-swift-proxy, openstack-swift-object, openstack-swift-account, openstack-swift-container, +5 more Red Hat OpenStack Platform 17.1 python3-swift, openstack-swift, openstack-swift-proxy, openstack-swift-object, openstack-swift-account, openstack-swift-container, +5 more Red Hat OpenStack Platform 18.0 openstack-swift, rhoso/openstack-swift-base-rhel9, rhoso/openstack-swift-object-rhel9, rhoso/openstack-swift-account-rhel9, rhoso/openstack-swift-container-rhel9, rhoso/openstack-swift-proxy-server-rhel9
    affected: workaround, no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.84% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • OpenStack Swift

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.