A flaw was found in the cookie parsing logic of the libsoup HTTP library, used in GNOME applications and other software. The vulnerability arises when processing the expiration date of cookies, where a specially crafted value can trigger an integer overflow. This may result in undefined behavior, allowing an attacker to bypass cookie expiration logic, causing persistent or unintended cookie behavior. The issue stems from improper validation of large integer inputs during date arithmetic operations within the cookie parsing routines.
Conclusion & alert: CVE-2025-4945 is rated Low Risk (28.5/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.50%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.30% | 0.50% | +0.20% |
| 2 | 2026-03-21 | 0.96% | 0.30% | -0.67% |
| 3 | 2026-03-15 | — | 0.96% | — |
Full EPSS history (9 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 3.7 | 3.1 | LOW |
|
2.2 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-4945 not yet assigned priority: Debian including 2 source packages (libsoup2.4, libsoup3), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 3. | https://security-tracker.debian.org/tracker/CVE-2025-4945 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2025-4945 |
suse
|
low | CVE-2025-4945 severity low: SUSE including 52 source package names (curl-8.14.1-slfo.1.1_4.1, latest:curl-8.14.1-slfo.1.1_4.1, …), 99 product×package rows across 32 product lines (Container suse/sl-micro/6.0/baremetal-os-container, Container suse/sl-micro/6.0/base-os-container, … (32 product lines)): Fixed 99. | https://www.suse.com/security/cve/CVE-2025-4945/ |
ubuntu
|
medium | CVE-2025-4945 medium priority: Ubuntu including 2 source packages (libsoup2.4, libsoup3), 16 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): released 11, ignored 2, needs-triage 2, DNE 1. | https://ubuntu.com/security/CVE-2025-4945 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||