CVE-2026-45700: freerdp Out-of-bounds Write
Vulnerability summary
CVE-2026-45700 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in freerdp. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 55.1% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 7 · Related 5Timeline
- 29-05-2026PublishedVulnerability first disclosed.
- 29-07-2026Last modifiedVulnerability information updated.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.
CVSS metrics
8 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- NVDNIST7.7HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVE.orgCNA8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HDiffers
- OSV · Red hatEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.78%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
-3.61 pp
From 4.39% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundFreerdp
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Redhat9 products
- freerdp< 2:2.11.7-7.el9_8.4 | < 2:2.11.7-10.el8_10 | < 2:2.11.2-1.el9_4.9 | < 2:2.2.0-14.el8_4.1 | < 2:2.2.0-12.el8_8.9 | < 2:2.2.0-7.el8_6.9 | < 2:2.4.1-6.el9_2.10 | < 2:2.11.7-1.el9_6.11 | < 0:2.1.1-5.el7_9.10
- freerdp-debuginfo< 2:2.11.7-7.el9_8.4 | < 2:2.11.7-10.el8_10 | < 2:2.11.2-1.el9_4.9 | < 2:2.2.0-14.el8_4.1 | < 2:2.2.0-12.el8_8.9 | < 2:2.2.0-7.el8_6.9 | < 2:2.4.1-6.el9_2.10 | < 2:2.11.7-1.el9_6.11 | < 0:2.1.1-5.el7_9.10
- freerdp-debugsource< 2:2.11.7-7.el9_8.4 | < 2:2.11.7-10.el8_10 | < 2:2.11.2-1.el9_4.9 | < 2:2.2.0-14.el8_4.1 | < 2:2.2.0-12.el8_8.9 | < 2:2.2.0-7.el8_6.9 | < 2:2.4.1-6.el9_2.10 | < 2:2.11.7-1.el9_6.11
- freerdp-devel< 2:2.11.7-7.el9_8.4 | < 2:2.11.7-10.el8_10 | < 2:2.11.7-1.el9_6.11 | < 0:2.1.1-5.el7_9.10
- freerdp-libs< 2:2.11.7-7.el9_8.4 | < 2:2.11.7-10.el8_10 | < 2:2.11.2-1.el9_4.9 | < 2:2.2.0-14.el8_4.1 | < 2:2.2.0-12.el8_8.9 | < 2:2.2.0-7.el8_6.9 | < 2:2.4.1-6.el9_2.10 | < 2:2.11.7-1.el9_6.11 | < 0:2.1.1-5.el7_9.10
Debian2 products
- freerdp2All versions (No fix recorded)
- freerdp3All versions (No fix recorded) | < 3.26.0+dfsg-1
Ubuntu2 products
- freerdp2< 2.2.0+dfsg1-0ubuntu0.18.04.4+esm6 | < 2.6.1+dfsg1-0ubuntu0.20.04.2+esm4 | < 2.6.1+dfsg1-3ubuntu2.11 | < 2.11.5+dfsg1-1ubuntu0.1~esm6
- freerdp3< 3.5.1+dfsg1-0ubuntu1.6 | < 3.16.0+dfsg-2ubuntu0.5 | < 3.24.2+dfsg-1ubuntu1.1
Freerdp1 product
- freerdp< 3.26.0
4 vendors · 14 products
References
31 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mpxh-8fq3-x8mhX Refsource CONFIRMARTICLEREPORTExploitMitigationVendor Advisory
