7.5

CVE-2026-11586: WS Auto-PONG memory exhaustion

Modified
AliasesALPINE-CVE-2026-11586UBUNTU-CVE-2026-11586DEBIAN-CVE-2026-11586
Published 03-07-2026Last modified 15-09-2026

Vulnerability summary

CVE-2026-11586 is a high (CVSS 7.5) vulnerability in curl. EPSS estimates a 0.86% chance of exploitation in the next 30 days, higher than 58.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.86%
0%100%
Low · +0.25 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:11230-1RHSA-2026:29017RHSA-2026:34975CGA-6G5W-9GPQ-H2QWUSN-8525-1

Timeline

  1. 03-07-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

Description

By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.86%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

Increase +0.25 pp

From 0.61% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard10 products
  • eco-python-curl< 8.21.0-r0
  • eco-python-curl-minimal< 8.21.0-r0
  • eco-python-curl-minimal-bin< 8.21.0-r0
  • eco-python-curl-minimal-dev< 8.21.0-r0
  • eco-python-curl-minimal-doc< 8.21.0-r0
Alpine1 product
  • curl≥ 8.16.0, < 8.22.0-r0 | ≥ 8.16.0, < 8.21.0-r0
Curl1 product
  • curl≥ 8.16.0, < 8.16.1 | ≥ 8.17.0, < 8.20.1 | ≥ 0b091328773c64e23f5c4739da74527093c6a5ab, < 849317ff5c5a5e13f50ec3d001e46ddffa77d8a4 | 8.20.0 | 8.19.0 | 8.18.0 | 8.17.0 | 8.16.0
Debian1 product
  • curl< 8.21.0~rc3-1
Haxx1 product
  • curl≥ 8.16.0, < 8.21.0
Ubuntu1 product
  • curl< 8.18.0-1ubuntu2.3

6 vendors · 15 products

References

11 links
Show all 11 references