3.4

CVE-2026-12547: libsoup2.4

CVSS: 3.4v3.1LowAwaiting analysis
AliasesUBUNTU-CVE-2026-12547DEBIAN-CVE-2026-12547
Published 21-07-2026Last modified 21-07-2026
Open JSON

Vulnerability summary

CVE-2026-12547 is a low (CVSS 3.4) vulnerability in libsoup2.4. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.7% of scored vulnerabilities.

Overall risk
14/100
0100
Low · default modelHow is this calculated?
CVSS score
3.4/10
010
Low · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2026:12084-1SUSE-SU-2026:4557-1SUSE-SU-2026:4558-1SUSE-SU-2026:4690-1SUSE-SU-2026:4703-1SUSE-SU-2026:4739-1

Timeline

  1. 21-07-2026
    PublishedVulnerability first disclosed.
  2. 21-07-2026
    Last modifiedVulnerability information updated.

Description

SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

0.00 pp

From 0.23% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • libsoup2.4All versions (No fix recorded)
  • libsoup3All versions (No fix recorded) | < 3.8.0-1
Ubuntu2 products
  • libsoup2.4All versions (No fix recorded)
  • libsoup3All versions (No fix recorded)

2 vendors · 4 products

References

6 links