6.1

CVE-2026-59883: guzzle Origin Validation Error

CVSS: 6.1v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-59883DEBIAN-CVE-2026-59883CGA-9fvj-69rr-387f
Published 08-07-2026Last modified 09-07-2026
Open JSON

Vulnerability summary

CVE-2026-59883 is a medium (CVSS 6.1) Origin Validation Error vulnerability in guzzle. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.6% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
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 0 · Related 1
CGA-WHP6-WXH4-P3HM

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

Description

Guzzle is an extensible PHP HTTP client. Prior to 7.12.3, CookieJar did not restrict cookies scoped to IP-address or bare-numeric Domain values to the exact host that set them, because SetCookie::matchesDomain() applied ordinary suffix matching to domains such as 192.168.0.1, [::1], or 1, allowing cross-host cookie disclosure, cookie injection, or session fixation. This issue is fixed in version 7.12.3.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.17%

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

Chainguard1 product
  • nextcloud-server-31< 31.0.14-r5
Debian1 product
  • guzzleAll versions (No fix recorded) | < 7.12.3-1
Guzzle1 product
Guzzlephp1 product
Ubuntu1 product
  • guzzleAll versions (No fix recorded)

5 vendors · 5 products

References

9 links