Libsoup: heap buffer overflows in sniff_feed_or_html() and skip_insignificant_space()
A flaw was found in libsoup. A vulnerability in sniff_feed_or_html() and skip_insignificant_space() functions may lead to a heap buffer over-read.
- BDU:2025-05231
- ALSA-2025:4560
- ALSA-2025:7436
- ALSA-2025:8292
- DLA-4140-1
- openSUSE-SU-2025:15018-1
- RHSA-2025:4440
- RHSA-2025:4508
- RHSA-2025:4560
- RHSA-2025:4568
- RHSA-2025:7436
- RHSA-2025:8292
- RLSA-2025:4560
- RLSA-2025:8292
- SUSE-SU-2025:01503-1
- SUSE-SU-2025:01504-1
- SUSE-SU-2025:1503-1
- SUSE-SU-2025:1504-1
- SUSE-SU-2025:1509-1
- SUSE-SU-2025:1510-1
- Published
- Apr 3, 2025
- Updated
- Jun 30, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- CWE-126
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · redhat
- 6.5
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
gitlab.gnome.org/GNOME/libsoup/ libsoup
- before 3.6.1affected · semver
Red Hat Red Hat Enterprise Linux 10
- all versionsunknown
Red Hat Red Hat Enterprise Linux 6
- all versionsunknown
Red Hat Red Hat Enterprise Linux 7
- all versionsunknown
Red Hat Red Hat Enterprise Linux 8
- 0:2.62.3-8.el8_10 and laternot affected · rpm
- 0:2.8-3.el8_10.1 and laternot affected · rpm
- 0:8.10-1 and laternot affected · rpm
- 0:2.62.3-8.el8_10 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
- 0:2.62.3-3.el8_8.4 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9
- 0:2.72.0-10.el9_6.1 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
- 0:2.72.0-8.el9_2.4 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
- 0:2.72.0-8.el9_4.4 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | libsoup | before 2.62.3-8.el8_10 | 2.62.3-8.el8_10 |
| AlmaLinux:8 | libsoup-devel | before 2.62.3-8.el8_10 | 2.62.3-8.el8_10 |
| AlmaLinux:8 | mingw32-freetype | before 2.8-3.el8_10.1 | 2.8-3.el8_10.1 |
| AlmaLinux:8 | mingw32-freetype-static | before 2.8-3.el8_10.1 | 2.8-3.el8_10.1 |
| AlmaLinux:8 | mingw64-freetype | before 2.8-3.el8_10.1 | 2.8-3.el8_10.1 |
| AlmaLinux:8 | mingw64-freetype-static | before 2.8-3.el8_10.1 | 2.8-3.el8_10.1 |
| AlmaLinux:9 | libsoup | before 2.72.0-10.el9_6.1 | 2.72.0-10.el9_6.1 |
| AlmaLinux:9 | libsoup-devel | before 2.72.0-10.el9_6.1 | 2.72.0-10.el9_6.1 |
| Debian:11 | libsoup2.4 | before 2.72.0-2+deb11u2 | 2.72.0-2+deb11u2 |
| Debian:12 | libsoup2.4 | all versions | — |
| Debian:12 | libsoup3 | before 3.2.3-0+deb12u1 | 3.2.3-0+deb12u1 |
| Debian:13 | libsoup2.4 | before 2.74.3-10 | 2.74.3-10 |
| Debian:13 | libsoup3 | before 3.6.1-1 | 3.6.1-1 |
| openSUSE:Tumbleweed | libsoup2 | before 2.74.3-8.1 | 2.74.3-8.1 |
| Red Hat:enterprise_linux:8::appstream | libsoup-debuginfo | before 0:2.62.3-8.el8_10 | 0:2.62.3-8.el8_10 |
| Red Hat:enterprise_linux:8::appstream | libsoup-debugsource | before 0:2.62.3-8.el8_10 | 0:2.62.3-8.el8_10 |
| Red Hat:enterprise_linux:8::appstream | libsoup-devel | before 0:2.62.3-8.el8_10 | 0:2.62.3-8.el8_10 |
| Red Hat:enterprise_linux:8::appstream | spice-client-win | before 0:8.10-1.el8_10 | 0:8.10-1.el8_10 |
| Red Hat:enterprise_linux:8::appstream | spice-client-win-x64 | before 0:8.10-1.el8_10 | 0:8.10-1.el8_10 |
| Red Hat:enterprise_linux:8::appstream | spice-client-win-x86 | before 0:8.10-1.el8_10 | 0:8.10-1.el8_10 |
| Red Hat:enterprise_linux:8::baseos | libsoup | before 0:2.62.3-8.el8_10 | 0:2.62.3-8.el8_10 |
| Red Hat:enterprise_linux:8::crb | mingw-freetype | before 0:2.8-3.el8_10.1 | 0:2.8-3.el8_10.1 |
| Red Hat:enterprise_linux:8::crb | mingw32-freetype | before 0:2.8-3.el8_10.1 | 0:2.8-3.el8_10.1 |
| Red Hat:enterprise_linux:8::crb | mingw32-freetype-debuginfo | before 0:2.8-3.el8_10.1 | 0:2.8-3.el8_10.1 |
+33
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| gitlab.gnome.org/GNOME/libsoup/ libsoup | 3.6.1 | Vendor (CNA) |
| almalinux:libsoup | 2.62.3-8.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:libsoup-devel | 2.62.3-8.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mingw32-freetype | 2.8-3.el8_10.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mingw32-freetype-static | 2.8-3.el8_10.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mingw64-freetype | 2.8-3.el8_10.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:mingw64-freetype-static | 2.8-3.el8_10.1 · AlmaLinux:8 | Package registry (OSV) |
| debian:libsoup2.4 | 2.74.3-10 · Debian:13 | Package registry (OSV) |
| debian:libsoup3 | 3.2.3-0+deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:libsoup | 3.4.4-150600.3.7.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:libsoup2 | 2.74.3-150600.4.6.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:libsoup | 0:2.72.0-8.el9_4.4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:libsoup-debuginfo | 0:2.72.0-8.el9_4.4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:libsoup-debugsource | 0:2.72.0-8.el9_4.4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:libsoup-devel | 0:2.72.0-8.el9_4.4 · Red Hat:rhel_eus:9.4::appstream | Package registry (OSV) |
| red hat:mingw-freetype | 0:2.8-3.el8_10.1 · Red Hat:enterprise_linux:8::crb | Package registry (OSV) |
| red hat:mingw32-freetype | 0:2.8-3.el8_10.1 · Red Hat:enterprise_linux:8::crb | Package registry (OSV) |
| red hat:mingw32-freetype-debuginfo | 0:2.8-3.el8_10.1 · Red Hat:enterprise_linux:8::crb | Package registry (OSV) |
| red hat:mingw32-freetype-static | 0:2.8-3.el8_10.1 · Red Hat:enterprise_linux:8::crb | Package registry (OSV) |
| red hat:mingw64-freetype | 0:2.8-3.el8_10.1 · Red Hat:enterprise_linux:8::crb | Package registry (OSV) |
| red hat:spice-client-win | 0:8.10-1.el8_10 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:spice-client-win-x64 | 0:8.10-1.el8_10 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:spice-client-win-x86 | 0:8.10-1.el8_10 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:libsoup | 0:2.62.3-8.el8_10 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:mingw-freetype | 0:2.8-3.el8_10.1 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:spice-client-win | 0:8.10-1.el8_10 · Rocky Linux:8 | Package registry (OSV) |
| suse:libsoup | 3.4.4-150600.3.7.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
| suse:libsoup2 | 2.74.3-150600.4.6.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2025-320520 days apartLibsoup: heap buffer overflow in sniff_unknown()26Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-126 · Buffer Over-readCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2025:4440
- access.redhat.com/errata/RHSA-2025:4508
- access.redhat.com/errata/RHSA-2025:4560
- access.redhat.com/errata/RHSA-2025:4568
- access.redhat.com/errata/RHSA-2025:7436
- access.redhat.com/errata/RHSA-2025:8292
- access.redhat.com/security/cve/CVE-2025-32053
- bugzilla.redhat.com/show_bug.cgi?id=2357070
- gitlab.gnome.org/GNOME/libsoup/-/issues/426
- lists.debian.org/debian-lts-announce/2025/04/msg00036.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.